TomeNET

(5.2a) Fire-till-kill mode                                                      
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Your character will fire till kill, ie keep using your current (if eligible)
ranged attacks until the target dies or is no longer targettable.

Accessible via 'm' key, you can switch 'fire-till-kill' mode on or off.
While enabled, your character will keep firing a ranged weapon (ie a weapon in
your 'shooter' equipment slot) or spell (see below) once you initiated the
first shot until the target either dies or direct firing at it becomes
impossible/obstructed for any reason.
The main use besides making ranged weapon usage more relaxed is that you are
able to single out enemies you want to kill of big monster packs such as
escorts.

Fire-till-kill mode also works with spells and runes, same as with ranged
weapons, except it may stop under additional conditions such as having no more
mana or other effects that render you 100% unable to cast spells.
While it will also stop if your spell requires a clear line of sight and would
(while travelling to the target) hit other monsters on the way, some spells
which don't travel to their destination but arrive instantly (most notably ball
spells and mindcrafter spells) will not be affected by monsters crossing your
line of sight.

To manually stop fire-till-kill without moving or performing any other action,
just press the SPACE key. Note that SPACE also stops all other kinds of
repeatable actions such as searching or tunnelling.

Fire-till-kill does not work with any other type of attacks besides those
mentioned above.